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Friday, July 29th, 2022
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| 7:39a | [Crustacea • 2020] Guinope tiara • A New Genus and Species of Xanthoid Crab (Decapoda: Brachyura: Linnaeoxanthidae) from offshore hard bank habitats in the Gulf of Mexico
Abstract Speciose populations of small xanthoid crabs on offshore banks and reefs of the northern Gulf of Mexico include a new species that is not assignable to presently named genera. Morphological diagnoses of the new genus and species are underpinned by previously published gene sequence analyses, originally misattributed to another species but now known to apply to this taxon. Herein named Guinope tiara n. gen., n. sp., the species shows molecular phylogenetic affinities with the family Linnaeoxanthidae Števčić, 2005, an ally of panopeid and pseudorhombilid crabs. Specimens from Occulina banks off the Florida Atlantic coast, previously regarded to represent Garthiope barbadensis (Rathbun, 1921), are not that species but instead morphologically assignable to Guinope n. gen. Whether they represent variants of Guinope tiara n. gen, n. sp. or a second species of the genus awaits the collection of fresh materials for DNA analyses. Keywords: Decapoda, Xanthoidea, Linnaeoxanthidae, Guinope tiara, deep reef
Superfamily Xanthoidea MacLeay, 1838 Family Linnaeoxanthidae Števčić, 2005 Guinope n. gen. Type species. Guinope tiara n. sp. Diagnosis. Carapace broader than long, weakly convex, regions poorly defined by shallow grooves, surface granulate, granules increasing in size and density anteriorly in each region; frontal margin bilobed, slightly thickened by dense granules, median fissure distinct; anterolateral teeth moderately-well developed, arrayed in arc, first and second fused, nearly obsolete, giving appearance of three teeth, third and fourth acute to subacute with third directed anteriorly to anteromedially, fourth directed anteriorly to anterolaterally, fifth tooth reduced to small acute process. Chelipeds densely granulate on superior and extensor surfaces, carpus with superoflexor margin having two distinct acute to subacute processes, largest near distal margin, apex directed dorsally. Pereopods two through five (walking legs) with merus extensor margin bearing distinct row of distally-directed, subacute, triangular teeth, strongest distal. Male pleon anteriorly elongate, reaching beyond first pereopod condyle; second somite width subequal to that of first, obscuring seventh sternite except for, at most, small sliver to either side; third through fifth fused, sutures visible externally only as small notches laterally; telson rounded. Male first pleopod (gonopod) long, sinuous, reaching beyond anterior end of median sternal groove in pleonal depression, visible to either side of flexed pleon distally, apex narrowly spatulate. Male second pleopod one-third or less length of first. Etymology. The generic name Guinope honors our greatly admired colleague, Danièle Guinot, for her extensive contributions to studies of xanthoid and other brachyuran crabs over a very distinguished career. Guinope tiara n. gen., n. sp. Diagnosis. Carapace wider than long (length near 2/3 width), dorsal surface weakly convex, regions poorlydefined, granulate, size and density of granules increasing anteriorly in each region; frontal margin bilobed, median fissure distinct; anterolateral teeth arrayed in arc, first and second often fused, appearing as weakly spiniform lobes to nearly obsolete, third and fourth acute to subacute, third directed anteriorly to anteromedially, fourth directed anteriorly to anterolaterally, fifth at most a denticle or subacute process. Chelipeds densely granulate on superior and extensor surfaces, carpus superoflexor margin with two distinct acute to subacute processes, largest distal, apex directed dorsally. Pereopods two through five (walking legs) with merus superior margin bearing distinct row of small distally directed, triangular teeth, strongest distal. Male pleon anteriorly elongate, reaching beyond first pereopod condyle; second somite width subequal to that of first, seventh sternite obscured or at most visible as small sliver to either side; third segment proximo-lateral extremities broadly subtriangular, unevenly rounded, slightly overreaching fifth pereopod coxa proximally; third through fifth fused, sutures visible externally only as small notches laterally; sixth segment slightly broader than long; telson rounded. Male first pleopod (gonopod 1) long, sinuous, reaching beyond anterior end of median sternal groove, visible to either side of pleon distally, apex narrowly spatulate. Male second pleopod less than one-third length of first. Applicable GenBank sequence accession numbers for USNM 1543542 (= ULLZ 8170) and USNM 1577463 holotype (= ULLZ 8183, part) are as follow: (16s) EU863367, EU863366; (12s) EU863301, EU863300. Habitat. Abundant on offshore reefs and banks, especially in small cavities and interstices of eroded hard substrates as well as among sponges, bryozoans, corals, encrusting algae, and other epibiota of fouling communities. Confirmed depth records range from 58–143 m; some additional collections are from within sponges taken at depths estimated to be 200–300 m (Aransas Bank, TX). Distribution. Middle to outer continental shelf waters of the northeastern to northwestern Gulf of Mexico. Etymology. The name “tiara” alludes to the reddish pattern that typically spans the dorsal carapace, the shape of which suggests the elevated front of a tiara or crown. Brent P. Thoma and Darryl L. Felder. 2020. A New Genus and Species of Xanthoid Crab (Decapoda: Brachyura) from offshore hard bank habitats in the Gulf of Mexico. Zootaxa. 4731(3):403-413. DOI: 10.11646/zootaxa.4731.3.8 | ||||||||
| 7:40a | [Ichthyology • 2022] Tempestichthys bettyae • A New Genus and Species of Ocean Sleeper (Gobiiformes: Thalasseleotrididae) from the central Coral Sea
Abstract The Thalasseleotrididae is a small family of exclusively marine gobioids. They form a sister taxon to the Gobiidae and Oxudercidae and are distinguished from most species in these families by having six branchiostegal rays and a membrane linking the hyoid arch to the first ceratobranchial. Here we use micro-CT informed morphological data and molecular phylogenetics to describe a new genus and species of thalasseleotridid discovered on a tropical oceanic coral reef in the central Coral Sea. Tempestichthys bettyae gen. et sp. nov. is the first tropical thalasseleotridid and differs from other members of the Thalasseleotrididae by having a T-shaped palatine and a distinctive shape and colouration. The three previously described thalasseleotridid species are endemic to temperate coastal waters of southern Australia and New Zealand and are all translucent brown with dorsoventrally compressed heads. However, Tempestichthys bettyae is laterally compressed with a pointed snout and is translucent white with opaque white and crimson red markings and a largely crimson iris. We discuss the unique characters of this new genus, including its distribution, form, colouration and diminutive size, and highlight the potential of there being undescribed diversity in the Thalasseleotrididae. Key words: Australia, coral reef, cryptic, cryptobenthic fishes, Gobiidae, Gobioidei, morphology, osteology, phylogeny, tropical  Tempestichthys bettyae gen. et sp. nov. Christopher H. R. Goatley and Luke Tornabene. 2022. Tempestichthys bettyae, A New Genus and Species of Ocean Sleeper (Gobiiformes, Thalasseleotrididae) from the central Coral Sea. Systematics and Biodiversity. 20(1); 1-15. DOI: 10.1080/14772000.2022.2090633 | ||||||||
| 7:42a | [Cnidaria • 2022] Diplopathes antarctica, D. multipinnata & D. tuatoruensis • New Genus and Species of Black Coral (Anthozoa: Antipatharia: Schizopathidae) from the SW Pacific and Antarctica
Abstract A new genus, Diplopathes, in the family Schizopathidae, and three new species are described from the Southwest Pacific and Antarctic region based on morphological data. The new genus superficially resembles Telopathes in being branched and having simple, bilateral pinnules, but differs in having strictly alternately arranged pinnules, and in having small polyps 4 mm or less in transverse diameter. Mitochondrial DNA placed Diplopathes and Telopathes in separate clades within the Schizopathidae, thus supporting the significance of seemingly subtle anatomical differences. The new species are: D. antarctica, with sparse branching, pinnules of up to 7 cm long, and polypar spines up to 0.045 mm tall; D. multipinnata, with dense branching, pinnules up to 3 cm long, and polypar spines up to 0.1 mm tall; and D. tuatoruensis, with very sparse branching, pinnules up to 10 cm long, and polypar spines up to 0.1 mm. Interestingly, the three new species do not form a monophyletic clade based on mitochondrial DNA. We propose and discuss two hypotheses to explain the results of the phylogenetic reconstruction, including that molecular and physical change are uncoupled or that we have uncovered another example of morphological convergence in unrelated species. Keywords: Coelenterata, Morphological convergence, ITS2, mitochondrial DNA, New Zealand, SRP54, taxonomy, Telopathes  Dennis M. Opresko, Rob Stewart, Tatiana Voza, Di Tracey and Mercer R. Brugler. 2022. New Genus and Species of Black Coral from the SW Pacific and Antarctica (Cnidaria: Anthozoa: Antipatharia: Schizopathidae). Zootaxa. 5169(1); 31-48. DOI: 10.11646/zootaxa.5169.1.3 | ||||||||
| 9:00a | [Botany • 2022] Lepanthes sylvilagus (Orchidaceae: Pleurothallidinae) • A New Species of Lepanthes with rabbit ear-like petals endemic to Colombia
Abstract A new species of Lepanthes from the department of Antioquia apparently restricted to the north-central Andes of Colombia is described and illustrated. The new species is similar to L. alcicornis; however, it can be easily distinguished by the transversally lobulate petals that resemble the ears of a rabbit, the reniform lip with suboblong basal lobes surrounding the column, and the absence of an appendix on the lip. Keywords: Endemism, Lepanthes alcicornis, orchid new species, San José de la Montaña
Lepanthes sylvilagus E.Restrepo & S.Vieira-Uribe, sp. nov. Diagnosis: Lepanthes sylvilagus is most similar to L. alcicornis in the plant habit and general flower morphology, but easily distinguished by the transversely bilobed petals, with the upper lobe oblong to narrowly triangular and twice the length of the ovate, narrowly triangular lower lobe (vs. transversely bilobed petals with both lobes similar in length the lower lobe variably bifurcate, with narrowly linear-triangular lobes). Etymology: In allusion to the shape of the petals that resemble the ears of cottontail rabbits, Sylvilagus spp.
Eugenio Restrepo, Sebastián Vieira-Uribe, Juan Sebastián Moreno and Luis E. Baquero. 2022. A New Species of Lepanthes (Orchidaceae: Pleurothallidinae) with Rabbit Ear-like Petals endemic to Colombia. Lankesteriana: International Journal on Orchidology. 22(1); 1–8. DOI: 10.15517/lank.v22i1.50373  Resumen: Se describe e ilustra una nueva especie de Lepanthes del departamento de Antioquia aparentemente restringida al centro-norte de los Andes centrales de Colombia. La nueva especie es similar a L. alcicornis, sin embargo, puede diferenciarse fácilmente por los pétalos transversalmente lobulados que recuerdan las orejas de un conejo, el labelo reniforme con lóbulos basales sub-oblongos que rodean la columna y la ausencia de apéndice en el labelo. Palabras clave: endemismo, Lepanthes alcicornis, nueva especie de orquídea, San José de la Montaña |
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