Panamapisa Alves & Lowry & Neves & Johnsson 2021, gen. nov.
Creators: name: Alves, Jessika
name: Lowry, James K.
name: Neves, Elizabeth G.
name: Johnsson, Rodrigo
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Eriopisidae
Panamapisa

description: Panamapisa gen. nov.
(Figs 1–5)
urn:lsid:zoobank.org:act: B5BABBD7-F3D9-489C-A27B-FC34731C696E
Type species. Panamapisa guaymii sp. nov., monotypy.
Included species. Panamapisa guaymii sp. nov..
Diagnostic description. Body subcylindrical. Head eyes absent; anteroventral margin excavate. Antenna 1 longer than antenna 2; accessory flagellum absent. Antenna 2 peduncular article 1 bulbous. Maxilla 1 inner plate with 4 apical plumose setae; palp well-developed, 2-articulate. Maxilla 2 inner plate with oblique setal row. Mandible palp well-developed, 3-articles, palp article 3 shorter than article 2, palp tapering distally. Labium inner plates well-developed. Maxilliped palp article 2 extending well beyond outer plate; outer plate large, rounded apically with large robust setae.
Gnathopod 1 coxa not anteroventrally produced; merus greatly enlarged with setae posteriorly. Gnathopod 2 propodus longer than broad, palm with sinus, palm without large marginal robust setae. Pereonites without stalked gills; without sternal gills. Pereopod 4 coxa without a posteroventral lobe. Pereopod 5 short, reaching into merus of pereopod 6. Pereopods 5–7 dactyli with fringing setae. Pereopod 6 simple, not prehensile; basis posteroventral corner forms a narrow triangle. Pereopod 7 basis posteroventral corner forms a narrow triangle.
Pleopod 3 not sexually dimorphic. Urosomite 2 without small robust setae dorsally. Uropod 1 with basofacial seta. Uropod 2 exopod shorter than endopod. Uropod 3 not sexually dimorphic; rami narrow; endopod small; exopod about 0.7 × length of body, length 14. 5 × breadth, without many robust setae; with 2 articles, article 2 very long. Telson slightly cleft, as long as broad with two distolateral robust setae.
Remarks. Panamapisa is a distinctive interstitial marine genus with a subcylindrical body. It has several characters states not shared with other eriopisids: the largest gnathopod 1 merus among the Eriopisidae, by far the longest third uropods, 70% of the body length and a slightly cleft telson. The nearest comparison for known eriopisids is one-third to one-quarter of the body length. Of those species only Eriopisa Stebbing, 1890 and Victoriopisa Karaman & Barnard, 1979 have inner lobes on the labium. Neither Eriopisa nor Panamapisa have a basofacial robust seta on the peduncle of uropod 1.
Panamapisa is similar to Eriopisa in having maxilla 1 inner plate with setae along the medial margin, gnathopod 1 palm with a large sinus and uropod 1 peduncle without a basofacial robust seta. They differ most significantly in the antenna 1 accessory flagellum (present in Eriopisa and absent in Panamapisa), maxilla 2 inner plate with an oblique setal row (absent in Panamapisa), gnathopod 1 coxa anteroventrally produced (not produced in Panamapisa), gnathopod 2 palm robust setae (present in Eriopisa, without robust setae in Panamapisa), the dactyli of pereopods 5–7 (marginal setae absent in Eriopisa, with marginal setae in Panamapisa) and the length of uropod 3 (about 30% in Eriopisa, nearly 75% of the body length in Panamapisa).
Distribution. Bocas del Toro, Panama (9°20’03.6”N 82°14’51.5”W)
description: Published as part of Alves, Jessika, Lowry, James K., Neves, Elizabeth G. & Johnsson, Rodrigo, 2021, A new genus and species, Panamapisa guaymii gen. nov. sp. nov., the first record of the family Eriopisidae Lowry & Myers, 2013 from Central America, pp. 273-281 in Zootaxa 4927 (2) on pages 274-275, DOI: 10.11646/zootaxa.4927.2.7, http://zenodo.org/record/4537113