Reyssia, Gerken, 2018

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 181

Reyssia n. gen.

Platytyphlops .— Reyss, 1978b: 74–77, figs 2–3.

Diagnosis. Carapace dorsoventrally flattened, marginal carina present, eyelobe present, pseudorostral lobes short, blunt. Antennule flagella well developed, accessory flagellum at least 0.5 length of main flagellum. Mandible unknown. Maxillule palp unknown. Pereopod 1 slender. Pereopod 5 shorter than pereopod 4 basis. Telson short, 0.5 length of uropod peduncles. Uropod endopod of 3 articles. Uropod exopod article 1 0.2 length of article 2, or less. Female with fully developed exopod on pereopod 2, rudimentary exopods on pereopods 3–4. Male with short but non-clasping antenna, without penial lobes, without pleopods.

Etymology. The new genus is named Reyssia in honor of Daniel Reyss, who originally described the type species (as Platytyphlops lathierae ). Gender feminine.

Type species. Platytyphlops lathierae Reyss, 1978b .

Remarks. Platytyphlops was erected by Stebbing (1912) to accommodate a new species, P. peringueyi , based on males without pleopods. However, Stebbing’s material only included early juvenile males. Stebbing (1912) included Platyaspis orbicularis in Platytyphlops , because the description of the species by Calman (1905) was incomplete and adult males were not known. However, Calman (1912) completed the description of Platyaspis orbicularis , including adult males with 3 pairs of pleopods, and transferred the species to Paralamprops (transferred herein to Platytyphlops ). Day (1978) described the adult male of P. peringueyi , with 3 pairs of pleopods, and also transferred the species to the genus Paralamprops (transferred herein to Platytyphlops ). This effectively placed Platytyphlops in synonymy with Paralamprops , but Platytyphlops has been resurrected (see remarks for Platytyphlops ). However, Reyss (1978b) described a new species, Platytyphlops latheriae , a species in which the males are without pleopods, but which cannot be accommodated in Platytyphlops as resurrected. Băcescu (1988) declared “ Platytyphlops latheriaeí ” incertae sedis and suggested that a new genus would need to be erected to accommodate the species. The genus Reyssia is therefore erected for the species described as latheriae Reyss, 1978b .