Penaeus (Plagosopenaeus), 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 (Plagosopenaeus) subgen. nov.

Type species.

Palaemon canaliculatus Olivier, 1811.

Gender of subgenus.

Masculine.

Diagnosis.

Rostrum generally bearing 1 ventral tooth. Median sulcus at postrostral carina deep, long, about half carapace length. Adrostral sulcus as wide as postrostral carina, extending to near posterior margin of carapace. Gastrofrontal carina distinct, posterior end turning anterodorsally. Cervical carina with dorsal end a distance from dorsal carapace. Hepatic carina distinct. First pereiopod with ischial spine minute or absent. Fifth pereiopod bearing exopod. Sixth abdominal somite completely lacking dorsolateral sulcus. Telson without lateral spines. Thelycum closed.

Etymology.

The name Plagosopenaeus (from the Latin plagosus for banded) refers to this subgenus of Penaeus , which has a very striking banded body coloration.

Species included.

Penaeus (Plagosopenaeus) canaliculatus (Olivier, 1811).

Remarks.

This taxon corresponds to "gen. nov. 2" in the 11-genus scheme of fig. 3 in Yang et al. (2023). Mophologically, including coloration, this subgenus is extremely similar to Penaeus (Marsupenaeus) (see Yu and Chan 1986; Chan 1998) and such close affinity is also supported by the molecular data ( Yang et al. 2023: figs 2, 3). Penaeus (Plagosopenaeus) subgen. nov. only differs from Penaeus (Marsupenaeus) in lacking lateral spines on the telson (vs. bearing three pairs of lateral spines), the thelycum not pouch-like and the last transverse band on the sixth abdominal somite not interrupted ( Chan 1998).