Pterocladiophilaceae
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| Pterocladiophilaceae | |
|---|---|
Scientific classification  | |
| Clade: | Archaeplastida |
| Division: | Rhodophyta |
| Class: | Florideophyceae |
| Order: | Gracilariales |
| Family: | Pterocladiophilaceae Kung Chu Fan & George F. Papenfuss 1959: 38[1] |
The Pterocladiophilaceae is a small family of red algae containing 2 (or 3) genera of thallus parasitic algae.
The family Pterocladiophilaceae was originally established by Fan & Papenfuss (1959: 38) to accommodate their newly named genus and species, Pterocladiophila hemisphaerica, a parasite on Pterocladia lucida (R. Brown ex Turner) J. Agardh in New Zealand. This parastitic alga, which differs from all other parasitic red algae in having zonately divided tetrasporangia, was tentatively assigned to the Cryptonemiales. Fredericq & Hommersand (1990a), as an outgrowth of their detailed morphological study of Holmsella pachyderma (Reinsch) Sturch, a parasite algae feeding on Gracilaria and Gracilariopsis in Great Britain and Ireland that had been assigned to the Choreocolacaceae family, noted that it had a lot of similarities among Holmsella Sturch, Gelidiocolax Gardner, and Pterocladiophila. These various similarities include the pattern of vegetative cell division, catenate (chain-like) spermatangia, two-celled carpogonial branch, and the apparent absence of an auxiliary cell. Fredericq & Hommersand grouped these three genera in the Pterocladiophilaceae family, arguing that the cruciate division of tetrasporangia in Gelidiocolax and Holmsella was not a serious objection to uniting these genera with Pterocladiophila. Moreover, on the basis of certain features of spermatangial initiation, gonimoblast development, and the pattern of concavo-convex divisions of apical and cortical cells, they assigned the family to the Gracilariales.[2][3]
Pterocladiophila hemisphaerica K.-C.Fan & Papenfuss has shown due to Dna analysis, to be within the Ceramiales order, but the parasite was grouped with support as sister to the Gracilariales order.[4]
Genera
- Gelidiocolax N.L.Gardner, 1927 (2)
- Holmsella Sturch, 1926 (2)
Figures in brackets are approx. how many species per genus.[5]
Note, Pterocladiophila K.-C.Fan & Papenfuss, 1959 is not accepted as a species by the GBIF.[5] It has a sole species Pterocladiophila hemisphaerica K.-C.Fan & Papenfuss, that was originally described from New Zealand, and has also been recorded from the Caribbean (Stegenga and Vroman 1986). The species is accepted by AlgaeBase,[6] and WoRMS.[7]