Ptilomera

Ptilomera
Ptilomera sp.
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Clade: Pancrustacea
Class: Insecta
Order: Hemiptera
Suborder: Heteroptera
Family: Gerridae
Genus: Ptilomera
Amyot & Serville, 1843[1]
Type species
Gerris laticaudata
Hardwicke, 1823[2]

Ptilomera is a genus of water striders in the family Gerridae, belonging to the order Hemiptera. The genus was first described by Amyot and Serville in 1843. It comprises numerous species and includes some of the larger-bodied members of the family.

Anatomy of Ptilomera laticaudata, 1831
Anatomy of Ptilomera laticaudata among other insects, 1843

Taxonomy

The genus Ptilomera belongs to the order Hemiptera, suborder Heteroptera, and family Gerridae, a group commonly known as water striders.

Morphology

Species of Ptilomera exhibit several distinctive morphological characteristics. The hind femora are much longer than the mid femora, and the tarsal segments are fused. In males, the posterior half of the mid femora is lined with dense, woolly hairs. Male genitalia are characterised by symmetrical parameres. Females possess well-developed connexival spines on abdominal segment VII. Adults are relatively large for Gerridae, typically exceeding 15 mm (0.59 in) in body length.[3]

Prior to 1965, distinguishing among species of Ptilomera was difficult because descriptions were largely based on colour patterns, which are often unreliable, and because of high intraspecific variation in genitalic features. In a major revision of the genus, researchers demonstrated that other male genitalic structures, particularly the pygophore, proctiger (suranal plate), and parameres, provide more reliable diagnostic characters.[4] However, diagnostic features for females remained comparatively limited.[5]

Distribution

Ptilomera species are distributed across the Asia-Pacific region, including Southeast Asia (e.g., Malaysia, Thailand, Indonesia, and Singapore), as well as parts of Australasia (including New Guinea and nearby islands).[6][7][8]

Species within the genus, such as Ptilomera tigrina, have been recorded in Singapore and other parts of Asia.[3][9]

Habitat and ecology

Members of the genus inhabit freshwater environments including streams, rivers, and ponds. Like other Gerridae, they are aquatic predators and feed primarily on small invertebrates, including spiders and insects, that fall onto the water surface.[10]

Behaviour

Ptilomera species move across the water surface using specialised locomotion that relies on surface tension.[11] Their long legs distribute weight efficiently, preventing them from breaking the water surface. are able to stand and move on the water surface due to their low body mass and highly hydrophobic legs.[12] Their legs and tarsi are covered with numerous microscopic hairs (microsetae) with fine grooves, which allow them to remain afloat.[13] Other behavioural traits may include predator avoidance and mating interactions typical of water striders.[14]

Species

The following species are assigned to this genus:[1]

  • Ptilomera sp. on the water surface in Thung Yao, Pai District, Mae Hong Son 58130, Thailand
    Ptilomera sp. on the water surface in Thung Yao, Pai District, Mae Hong Son 58130, Thailand
  • Ptilomera sp. on the water surface in Pune, Maharashtra, India
    Ptilomera sp. on the water surface in Pune, Maharashtra, India
  • Ptilomera sp. on the Periyar River, India
    Ptilomera sp. on the Periyar River, India
  • Ptilomera sp. on the water surface in India
    Ptilomera sp. on the water surface in India

References

  1. ^ a b "Ptilomera Amyot & Serville, 1843". Global Biodiversity Information Facility. Retrieved 14 April 2026.
  2. ^ Imtiaz; Sundas; Saleem, Rukhshanda; Zia, Syed Ahmed; Afsheen, Sumera; Cianferoni, Fabio (2026). "First record of Ptilomera laticaudata (Hardwicke, 1823) from Pakistan extending the known range of the genus, with additional new records of water striders for the country (Hemiptera: Heteroptera: Gerridae)". Oriental Insects: 1–14. doi:10.1080/00305316.2026.2619080.
  3. ^ a b Cheng, L.; Yang, C. M.; Anderson, N. M. (2001). Guide to the aquatic Heteroptera of Singapore and Peninsular Malaysia. I. Gerridae and Hermatobatidae (The Raffles Bulletin of Zoology ed.).
  4. ^ Hungerford, Herbert B.; Matsuda, Ryuichi (1965). "The genus Ptilomera Amyot and Serville (Gerridae: Hemiptera)". University of Kansas Science Bulletin. 45 (5): 397–515.
  5. ^ Vitheepradit, A.; Sites, R. W. (2007). "A review of Ptilomera (Heteroptera: Gerridae) in Thailand, with descriptions of three new species". Annals of the Entomological Society of America. 100 (2): 139–151. doi:10.1603/0013-8746(2007)100[139:AROPHG]2.0.CO;2.
  6. ^ Leng, Z.; Zhang, B.; Ye, Z. (2024). "A taxonomic review of Ptilomera from China, with descriptions of two new species (Hemiptera: Heteroptera: Gerridae)". European Journal of Entomology. 121: 146–172. doi:10.14411/eje.2024.017.
  7. ^ Jehamalar, E. E.; Chandra, K.; Basu, S.; Selvakumar, C. (2018). "Review of Ptilomera (Ptilomera) (Hemiptera: Heteroptera: Gerridae) from India, with description of a new species". Zootaxa. 4370 (5): 501–518. doi:10.11646/zootaxa.4370.5.3. PMID 29689821.
  8. ^ Polhemus, D. A.; Polhemus, J. T. (2001). "A revision of the genus Ptilomera (Heteroptera: Gerridae) on New Guinea and nearby islands". Journal of the New York Entomological Society. 109 (1–2): 81–166. doi:10.1664/0028-7199(2001)109[0081:AROTGP]2.0.CO;2.
  9. ^ "Ptilomera (Ptilomera) tigrina Uhler, 1860". Global Biodiversity Information Facility. Retrieved 13 April 2026.
  10. ^ Williams, D. D.; Feltmate, B. W. (1992). Aquatic insects. Wallingford: CAB International. pp. 48, 121, 218. ISBN 0-85198-782-6.
  11. ^ Bush, J. W. M.; Hu, D. L. (2006). "Walking on water: biolocomotion at the interface". Annual Review of Fluid Mechanics. 38: 339–369. doi:10.1146/annurev.fluid.38.050304.092157.
  12. ^ Koh, J. S.; Yang, E.; Jung, G. P.; Jung, S. P.; Son, J. H.; Lee, S. I.; Cho, K. J. (2015). "Jumping on water: Surface tension-dominated jumping of water striders and robotic insects". Science. 349 (6247): 517–521. doi:10.1126/science.aab1637. PMID 26228144.
  13. ^ Gao, X.; Jiang, L. (2004). "Water-repellent legs of water striders". Nature. 432 (7013): 36. doi:10.1038/432036a. PMID 15525973.
  14. ^ Arnqvist, Göran (1997). "The evolution of water strider mating systems: causes and consequences of sexual conflict". The evolution of mating systems in insects and arachnids. Cambridge University Press. pp. 146–163. doi:10.1017/CBO9780511721946.009. ISBN 978-0-521-58029-8.

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