Penaeus (Altiopeneaus), 2023

Chan, Tin-Yam, 2023, New subgeneric names for the most commercially important shrimp genus Penaeus Fabricius, 1798 (Crustacea, Decapoda, Penaeidae), ZooKeys 1141, pp. 29-40 : 29

Penaeus (Altiopeneaus) subgen. nov.

Type species.

Penaeus marginatus Randall, 1840.

Gender of subgenus.

Masculine.

Diagnosis.

Rostrum usually armed with 2 ventral teeth. Postrostral carina lacking median sulcus. Adrostral sulcus as wide as postrostal carina, extending to near posterior margin of carapace. Gastrofrontal carina distinct, with posterior end turning anterodorsally. Cervical carina with dorsal end a distance from dorsal carapace. Hepatic carina distinct. First pereiopod with strong ischial spine. Fifth pereiopod bearing exopod. Sixth abdominal somite completely lacking dorsolateral sulcus. Telson with 3 pairs of lateral spines. Thelycum closed.

Etymology.

The name Altiopeneaus (from the Latin altio for deeper) alluding to members of this subgenus which have a deeper vertical (depth) distribution than other Penaeus .

Species included.

Penaeus (Altiopeneaus) marginatus Randall, 1840

Remarks.

This taxon corresponds to "gen. nov. 5" in the 11-genus scheme of fig. 3 in Yang et al. (2023). This subgenus is unusual in the genus in inhabiting deeper waters (see Chan 1998). It is also unique amongst the “grooved” species by completely lacking a median sulcus on the postrostral carina.