Cylindrostethus palmaris Drake & Harris, 1934

Lima Franco, Cleilton, Mourão dos Santos Rodrigues, Juliana, Silva de Azevêdo, Carlos Augusto & Moreira, Felipe Ferraz Figueiredo, 2021, Gerromorpha (Insecta, Hemiptera, Heteroptera) from eastern Maranhão state, northeastern Brazil, Check List 17 (2), pp. 551-568 : 554-557

Cylindrostethus palmaris Drake & Harris, 1934 Figure 5H–K

New records. BRAZIL • 2 ♂; Maranhão, Duque Bacelar, Araim stream; −04.16861, −042.99277; 14 Jul. 2019; C.L. Franco et al. leg.; LEAq 00012 • 26 ♂, 14 ♀; Maranhão, Caxias, Areia Branca stream; − 05.03720S, −043.48580; 13 Aug. 2019; C.L. Franco et al. leg.; LEAq 00055 •

1 ♂, 1 ♀; Maranhão, Caxias, Baixa Grande stream; −04.75722, −043.66055; 06 Aug. 2019; C.L. Franco et al. leg.; LEAq 00029 • 3 ♂, 1 ♀; Maranhão, Codó, Baixa Grande II stream; −04.73222, −043.70638; 05 Oct. 2019; C.L. Franco et al. leg.; LEAq 00191, 00193 • 2 ♂, 1 ♀; Maranhão, Caxias, Barragem stream; −04.87562, −043.09894; 10 Dec. 2019; C.L. Franco et al. leg.; LEAq 00238 • 5 ♂, 1 ♀; Maranhão, Caxias, Batatal stream; −04.96166, −043.38916; 07 Aug. 2019; C.L. Franco et al. leg.; LEAq 00009 • 3 ♂, 1 ♀; Maranhão, Caxias , Bu- riti stream; −04.91500, −043.11333; 28 Aug. 2019; C.L. Franco et al. leg.; LEAq 00159, 00165 • 3 ♂, 1 ♀; Maran- hão, Caxias, Cajazeiras stream; −05.01750, −043.42944; 07 Aug. 2019; C.L. Franco et al. leg.; LEAq 00030 • 2 ♂, 7 ♀; Maranhão, Caxias, Correntinho stream; −04.82666, −043.37694; 26 Aug. 2019; C.L. Franco et al. leg.; LEAq 00057, 00064, 00071, 00077 • 29 ♂, 31 ♀; Maranhão, Caxias, Inhamum stream; −04.89833, −043.43333; 26 Aug. 2019; C.L. Franco et al. leg.; LEAq 00020–00024, 00085, 00091 • 19 ♂, 11 ♀; Maranhão, Caxias, Jatobá stream; −04.90972, −043.11666; 28 Aug. 2019; C.L. Franco et al. leg.; LEAq 00121, 00128, 00136, 00141, 00144 • 1 ♂; Maranhão, Merim Lagoon ; −04.89861, −043.44027; 13 Aug. 2019; C.L. Franco et al. leg.; LEAq 00051 • 26 ♂, 11 ♀; Maranhão, Caxias, Lamego stream; −04.81527, −043.34361; 12 Aug. 2019; C.L. Franco et al. leg.; LEAq 00032, 00036, 00038 • 3 ♂, 2 ♀; Mara- nhão, Caxias, Limpeza stream; −04.67611, −043.54222; 27 Aug. 2019; C.L. Franco et al. leg.; LEAq 00092, 00101 • 8 ♂, 9 ♀; Maranhão, Caxias, Planaçucar stream; −04.90666, −043.36250; 12 Aug. 2019; C.L. Franco et al. leg.; LEAq 00045–00046, 00049 • 6 ♂ 2 ♀; Maranhão, Aldeias Altas, Poção stream; −04.67388, −043.54138; 27 Aug. 2019; C.L. Franco et al. leg.; LEAq 00200, 00220 • 4 ♂, 2 ♀; Maranhão, Caxias, Primavera stream; −04.84916, −043.49527; 06 Aug. 2019; C.L. Franco et al. leg.; LEAq 00002, 00173 • 14 ♂, 10 ♀; Maranhão, Cax- ias, Sumidouro stream; −04.88972, −043.43166; 05 Aug. 2019; C.L. Franco et al. leg.; LEAq 00027–00028 .

Identification. Cylindrostethus palmaris is the only South American species of the genus that displays wing dimorphism, with apterous and macropterous morphs ( Fig. 5H, J). Other species from the continent are entirely apterous, which makes identification of winged specimens immediate ( Floriano et al. 2016). Our apterous specimens were identified based on the body mostly yellow; the lateral black stripes of the mesonotum as wide as the median yellow stripe ( Fig. 5H); the black fore tibia; the posterior margin of male abdominal sternum VII emarginated at the middle ( Fig. 5I); and the basolateral processes of the male proctiger distinctly shorter than wide ( Floriano et al. 2016).

Distribution in Brazil. RR, AP, AM, PA, RO, MA, RN, BA, MT, GO, MS, MG, ES, SP, RJ.

Comments. Previously recorded in Maranhão from the municipalities of Timon and Imperatriz ( Rodrigues et al. 2012; Floriano et al. 2016).

Subfamily Gerrinae

Tribe Gerrini

Limnogonus Stål, 1868