Penaeus (Marsupenaeus) Tirmizi, 1971

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 (Marsupenaeus) Tirmizi, 1971

Type species.

Penaeus canaliculatus var. japonicus Bate, 1888.

Gender of subgenus.

Masculine.

Diagnosis.

Rostrum generally armed with1 ventral tooth. Median sulcus at postrostral carina deep, long, about half carapace length. Adrostral sulcus extending to near posterior margin of carapace, posterior part somewhat narrower than postrostal carina. Gastrofrontal carina distinct, with 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 with 3 pairs of lateral spines. Thelycum pouch-like.

Species included.

Penaeus (Marsupenaeus) japonicus Bate, 1888, Penaeus (Marsupenaeus) pulchricaudatus Stebbing, 1914.

Remarks.

Although this subgenus is unique in the genus by having a highly specialized pouch-like thelycum, males and juveniles are morphologically very similar to those of the subgenus Penaeus (Oleopenaeus) subgen. nov., except for coloration [see “Remarks” under Penaeus (Oleopenaeus) subgen. nov.].